Messages in this thread | | | Date | Mon, 15 Nov 2010 23:07:15 +0100 | Subject | Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ? | From | Richard Guenther <> |
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On Mon, Nov 15, 2010 at 7:45 PM, Jeff Law <law@redhat.com> wrote: > On 11/08/10 03:49, Richard Guenther wrote: >> >> On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen<andi@firstfloor.org> wrote: >>> >>> Andreas Schwab<schwab@linux-m68k.org> writes: >>>> >>>> The asm fails to mention that it modifies *regs. >>> >>> It has a memory clobber, that should be enough, no? >> >> No. A memory clobber does not cover automatic storage. > > A memory clobber should clobber anything in memory, including autos in > memory; if it doesn't, then that seems like a major problem. I'd like to > see the rationale behind not clobbering autos in memory.
Non-address taken automatic storage. (note that we don't excercise this in optimization yet)
It's difficult to model thins kind of non-aliased memory with this kind of aliasing mechanism (apart from taking all asms as clobbering everything as we currently do).
Richard.
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